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Peak ground acceleration (PGA) is the maximum acceleration of the ground by earthquake. However, the acceleration in the structure is higher because of dynamic amplification . In fact, for an average building the acceleration could be increased up to 2.5 to 3.0 PGA (Melbourne). Rigid buildings are controlled by acceleration. PGA can be well measured using strong motion accelerometers placed close of the epicenter of the earthquake. The response of the structure depends on the duration of the pulse and the time history as a whole, and not just the PGA. Peak ground velocity (PGV) gives more information about the response of structures, being a better indicator of damage than PGA. The difference between PGV and the velocity in the center mass of structure is less than PGA and a, that is to say, the velocity (V) is 1.8 to 2.0 PGV. Buildings less rigid are controlled for velocity. PGV can be measured by seismometers place far away of the epicente r, which could be quite complex. PG

Earthquakes are caused by relative movements between tectonics plates. The stress increase up until bond friction is broken and rupture occurs realizing energy in form of waves through the earth. The point where is originated the fault is called focus, and the point immediately upper in the ground is called epicenter. Other terms are hypocentral distance, epicentral distance. Faults can be generated by a combination of strike-slip and dip-slip . Strike slip is a horizontal movement between plates, which could it be strike left or right. If the fault is vertical, then it is called dip-slip, which could it be reverse if that rock moves up the fault and normal if it moves downward. Thrust fault when the dip angle is shallow, usually in subduction zones. Magnitude of Earthquakes is measured using the Richter scale.   The Richter scale measured the amplitude of the wave by means of seismograph, and corrected using a logarithmic scale . For instance, an increase in 1 de